Primus otto dorer



P. Q. DORER.

ELECTRIC LAMP FOR VEHICLES.

APPLICATION FILED AUG-25, I920.

1,399,940, I Patented Dec.13, 1921.

UNITED STATES PATENT OFFICE.

PRIMUS OTTO DOB/ER, OF LONDON, ENGLAND, ASSIGNOR T0 S. SMITH 6c SONS (MOTOR ACCESSORIES) LIMITED, OF LONDON, ENGLAND.

ELECTRIC LAMP FOR VEHICLES.

Specification of Letters Patent.

Patented Dec. 13, 1921.

Application filed August 25, 1920. Serial No. 405,947.

To all whom it may concern.

Be it known that I, PRIMUS OTTO Donnn, a subject of the King of England, residing in London, England, have invented certain new and useful Improvements in Electric Lamps for Vehicles, of which the following is a specification.

This invention relates to an electric lamp, for motor and other vehicles, of the type which has a detachable front hereinafter termed the bezel carrying a front glass and adapted to 'fit over, or into, the body part, its main object being the combination with a detachable bezel of improved means for retaining the detachable bezel in proper engagement with the front portion of the body part or for releasing it therefrom, without employing for either of these operations the lam reflector, which, therefore, can if desired, be fixed stationary in the body.

According to this invention in an electric lamp of thetype described there is combined a flange or lugs secured to the detachable bezel, a boss inside the back of the body, arms radiating from the boss toward the body front and shaped in front to engage the aforesaid flange or lugs, and means whereby from without the body the boss can be moved back to cause the arms to pull the detachable bezel home on the body, or moved forward to cause the arms to release it.

The fore ends of the arms may be hooked and are preferably guided in, and prevented from rotating by slots formed in an in.- turned flange on the said body.

The boss may conveniently be carried as a non-rotating nut on, and moved by,

stem of a screw, the head of which is accessible at the back end of the body and bears against the exterior of the latter.

Alternatively, the boss may be screwthreaded externally and moved endwise by a nut bearing against a collar fixed in the back end of the body.

The invention will be further described with reference to the accompanying drawings in which- Figure 1 is a side view of a lamp according to this invention shown partially in section to reveal the securing means for the bezel;

Fig. 2 is a view looking at the front of Fig. 1 with the bezel shown in section and partly cut away;

Fig. 3 is a side view, partly in section, of a lamp which is a modification of that shown in Figs. 1 and 2.

Referring first to Figs. 1 and 2, the body 1 of the lamp has its front margin spun inward to form a flange 2. A parabolic re flector 3 lies within the body 1 and has its front end spun outward so as to lie flat upon the flange 2, in which position it is secured preferably by screws. The bezel 5 is formed from an annular ring of sheet metal, of which one edge fits over the end of the body 1 and the other edge is bent round inwardly and is stepped at 6 to accommodate the front glass 7 and its packing. The extreme margin of this inwardly bent edge of the bezel is bent at right-angles to the step, so that an outwardly directed flange 8 is formed. This flange is interrupted as shown at 9 in Fig. 2 for a purpose to be hereinafter re ferred to.

Situated between the back of the body 1 and the rear end of the reflector is a boss 10 which is engaged by a screw 11, the head of which bears against the exterior of the body in a recess formed on the latter. Extending forwardly and radially from the rear face of the said boss are three arms 12 which with the boss 10 constitute a spider. These arms 12 extend at their forward ends through slots 12 formed in the flange 2 of the body, and so serve to prevent rotation of the boss 10; Each arm is bent over at the tip to form a book 13. The hooks so formed are for the purpose of engaging the uninterrupted portions of the flange 8 in order to hold the bezel in position on the lamp, and it is to clear these hooks when removing or attaching the said bezel that the flange 8 is formed with the interruptions 9. The hooks 13 and the recesses 9 thus constitute a bayonetjoint attachment for securing the bezel in position.

To attach the bezel to the body of the lamp, the said bezel is brought into a position in which the interruptions 9 in its flange 8 are opposite the hooked ends 13 of the arms 12. The bezel is then pressed toward the said body until the flange 8 passes the hooks when a partial rotation is given the said bezel so that the uninterrupted portions of its flange 8 are brought opposite the hooks 13. The screw 11 is then rotated to cause the boss 10 to move in a direction away from the front of the lamp, so that the hooks 13 engage the flange and the spider draws the bezel firmly into position.

Referring now to Fig. 3 this construction is similar in most respects to that already described with reference to Figs. 1 and 2, but in this case it is not necessary to rotate the bezel when attaching it to, or-removing it from the body of the lamp; the arms 12 in this case are permitted to move radially as well as forwardly at their hooked ends when the boss is caused to move toward the front of the lamp. The flange 8 on the bezel 5 is therefore not interrupted. To provide for the aforesaid movement of the arms these latter are pivoted to a boss 10, and are bent outwardly just behind the hooks 13 at their forward ends. The flange 2 is formed on a ring 2 attached to the inside of the body of the lamp, and the slots 12 through which the arms 12 extend are formed by striking in portions 14 of the said flange. l hese portionsare so disposed that they provide an inclined face upon which the outwardly bent portions of the arms 12 rest, so that the said outwardly bent portions of the said arms may slide along these struck-in portions of the flange 2 when the boss is moved toward or away from the front of the lamp. The screw arrangements for the boss are also slightly modified in this case. A tubular guide 17 is brazed or otherwise secured axially in the rear of the body and has at its front end a lug 17. The boss 1O" is splayed at its inner or front end, extends through the guide 17 and is screw-threaded externally on its. tubular rear portion, whereon it carries anut 16. The front splayed portion of the boss is cut away at one point to allow the lug 17 to pass through it, which lug then prevents the boss from turning when it is being secured in position by the nut 16. The extreme rear end of the boss 10 is split in an axial direction and encircled by a grip 18 which enables a tubular lamp-holder 19 slidable in the boss to be adjusted axially in the body of the lamp.

With this construction, therefore, when it is desired to detach the bezel from the body of the lamp. the nut is rotated so that the boss moves toward the front of the lamp, the forward ends of the arms 12 thus move forwardly and outwardly sliding along the inclined surface formed by the struck-in portions 1 1 of the flange. A position therefore is reached wherein the hooks 13 are clear of the bezel flange 8; the said bezel can then easily be removed.

It will be seen that when replacing the bezel the hooks will automatically engage the flange 8 when the spider is drawn backward by screwing up thenut.

Although a screw device has been shown in both constructions as the means for controlling the boss 10 it is to be understood that the invention is not limited thereto. It will be appreciated that various modifications may be made in the described con struction without-departing from the scope of the invention as set forth in the claims.

What I claim as my invention and desire to secure by Letters Patent is 1. The combination, with a lamp body, and a front member detachably mounted thereon, of a boss situated within the body at the rear thereof, arms radiating from said boss toward the front of the body, said arms co-acting at the front with the body and being shaped at the front to detachably engage said front member, and means arranged to be actuated from outside the body for moving said boss backward to cause the arms to pull said front member home on to the body, and forward to cause the arms to release the front member whereby the front member may be removed independently of said arms, substantially as described.

2. The combination, with a lamp body, of a front member detachably mounted thereon and having an internal flange disposed in a plane that is situated transversely of the longitudinal axis of said body,'a boss situated within the body at the rear thereof, arms radiating from said boss toward the front of the body and shaped each in the form of a hook at the front to detachably engage said flange, and means arranged to be actuated from outside the body for moving said boss backward to cause the arms to pull said front member home on to the body, and forward to cause the arms to release said flange, substantially as described.

3. The combination, with a lamp body, and a front member detachably mounted thereon, of a boss situated within the body at the rear thereof, arms radiating from said boss toward the front of the body and shaped at the front to detachably engage said front member, radially guiding'means on the body for guiding the'front ends of said arms independently of the rear thereof, and means arranged to be actuated from outside the body for moving said boss backward to cause the arms to pull said front member home on to the body, and forward to cause the arms to release the front member whereby the front member may be removed independently of said arms, substantially as described.

4-. The combination, with alamp body, of a front member detachably mounted thereon, and having an internal flange, a boss situated within the body at the rear thereof, arms radiating from said boss toward the front of the body and shaped at the front to engage said flange, said flange being recessed to constitute with the front ends of said arms a bayonet-joint attachment, and. means arranged to be actuated from outside the body for moving said boss backward to cause the arms to pull said front member home on to the body, and forward to cause the arms to release the said flange, substantially as described.

5. The combination, with a lamp body, of a front member detachably mounted thereon and having an internal flange disposed in a plane that is situated transversely of the longitudinal axis of said body, a spider situated within the body and having resilient arms shaped at the front to engage with and to be disengaged from said flange, and means operable from outside the body and engaging the rear of said spider for moving the same backward to pull the front member home on to the body, and forward to disengage the spider from said flange, substantially as described.

6. The combination of a lamp body, a reflector situated in and carried by the body with a clearance space between the same, a front member detachably mounted onsaid body, a boss situated within the body at the rear thereof, arms extending from said boss through said clearance space toward the front of the body and shaped at the front to detachably engage said front member, and means arranged to be actuated from outside the body for moving said boss backwardly to cause the arms to pull said front member home on to the body, and forwardly to permit the front member to be readily disengaged from said arms and removed from the lamp body independently of said arms, substantially as described.

In testimony whereof I afiix my signature.

PRIMUS ,OTTO DORER. 

